Works Cited

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http://library.thinkquest.org/J001418/seacuc.html
http://www.liveaquaria.com/product/prod_display.cfm?c=497+502+711&pcatid=711
http://en.wikipedia.org/wiki/Sea_urchin
http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artjul00/urchin1.html
http://www.starfish.ch/reef/echinoderms.html
http://science.jrank.org/pages/1038/Brittle-Star.html
http://oceanlink.island.net/biodiversity/seastars/seastars.html
http://animals.nationalgeographic.com/animals/invertebrates/starfish/
http://www.wetwebmedia.com/seastars.htm
http://www.youtube.com/watch?v=aCxKFc3XtJs
http://www.youtube.com/watch?v=GCpRLZmhKJY
http://animaldiversity.ummz.umich.edu/site/accounts/pictures/Echinodermata.html
http://tolweb.org/Echinodermata
http://www.fossilmuseum.net/Tree_of_Life/Phylum-Echinodermata.htm